I have heard Wesco dyno's marine engines with marine exhaust and accessories functioning. Put a set of car headers and remove the accessories like most people do and there's 500. Those will be some nice running motors!

yep it had the seawater pump ,alternator,and Marine headers on the engine, real world #'s just like they are in the boat. He told me that his dyno makes very few friends and makes a liar out of alot of them.....

Hey Dyno,
Good to hear your engines are running great. What did you decide to do with the exhaust?
Can not wait to hear the sonic run again..Dwight

Dyno/Don, just like you said; Dave's dyno will hurt your feelings-----and I think I may have told you this before, but remember there is a guy we both know that dyno'd one of his 540cid, his fully ported Dart Pro-1 aluminum heads, Crane 741 hyd roller cam on WESCO's dyno about 2 months ago. It came up to about 650hp at about 5800rpm when he was expecting something more like 700hp. After the dyno the engine was installed in the boat and it did about 1-2mph faster on the GPS. Apparently, there is about a 35-45hp different between WESCO's dyno, and Tom Earhart's dyno with WESCO's dyno showing more conservative numbers.

Also, Wette Vette is right. From what I was told, that when using a dry car style header on a dyno they create a lot more heat, and thus will make more HP vs. a dry jacketed marine style header that runs cooler temps---besides running a raw water sea pump/impeller, and alternator. So, don't let that dyno mess with your head too much----just put those bullets in your boat and it will be a "runner" more than what you think!

Now then, let's see who can be the first one to the launch ramp like you were talkin' earlier about in another thread???

I think the real difference is in using real boat exhaust compared to dyno headers,Tyler crockett also uses cmi elbow tops instead of dry dyno headers,people aren't always impressed with their numbers but they are realisticly close to what you'll have in the boat,Smitty

Man---I thought this was just a hobby! (???)

Dyno,
I may have missed this in earlier posts, but do you have a 31 or 35 Sonic? And are these the original 330's on roids upgraded? and what mph #'s were you seeing before? Just curious.
Jason

The boats a 31 the motors were done a few years ago by myself and Crazyhorse. This time around I went with a forged parts last time I had Hyperutectic pistons and cast rotating assemblies. I dropped the compression a bit from 9.5/1 to 8.8/1 went with a Hyd. roller cam and dry stacks I dont have the cam card I'll get it today when I go there. The boat runs about 70-72 on GPS with 1-3' water to loosen it up. The goal here is one thing turn key reliabilty power is only a passing thought....The torque is all in early but it doesn't drop off at all flat all the way to 5200.

Well Dave at Wesco does alot of things but blowing sunshine isnt one of them....

I couldn't agree more with you about the turn key aspect. After breaking 5 different rocker studs last season (each time in between Muskegon and Grand Haven), replacing seapumps, electric fuel pumps, and blowing up a drive at Croton Hardy my dreams of more power have slipped aside to reliability.

I have been out every weekend this summer and all I have had to do each time out is wash the boat, put props on, put in gas, put in drain plug, launch and repeat.

This season I am concentrating on interior and stereo!

Hope to see you and Mark out this season.
Jason